Text and Data Mining valid from 2019-01-25
Received: 26 June 2018
Accepted: 16 January 2019
First Online: 25 January 2019
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of the Maternity and Child Care Center of Liuzhou. Patients with a history of family heart disease were excluded from the study. All patients and healthy volunteers provided written informed consent prior to their inclusion within the study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.